As much as fans love Windows Phone, there are always little quirks that can annoy people with any operating system -- even if it's the one they prefer most. A good example of this is the battery icon in Windows Phone, mostly because it is hard to tell how much battery life you have without going into Battery Saver in your settings (which didn't even exist before Mango).

So for those who want to have a little more info on-hand about their batteries, we'd suggest taking a look at the new homebrew app Digital Power by Zealson. It's a simple app that provides the neat feature of letting you replace the battery indicator with various different styles. There are four types to choose from: the default, a Horizontal option with percents, a Vertical option with percents, and a stylish Circular choice. So long as you have a rooted Windows Phone (via a custom ROM or WP7 Root Tools) you can install the app, give it root privileges, pick your indicator choice, and reboot to see the change happen.

If you happen to have a build of Windows Phone on your device that's 8xxx (like 8107), Zealson says the app will not work properly. Make sure your compatible by visiting Settings (System) > About and if you are, visit the source link to pick up the XAP file for your device.

Source: XDA-Developers